München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Astroparticle Physics II

HK 29.2: Vortrag

Dienstag, 19. März 2019, 17:00–17:15, HS 18

Time correlated backgrounds in GERDA and LEGEND — •Mario Schwarz¹, Luciano Pandola², Stefan Schönert¹, and Christoph Wiesinger¹ for the LEGEND collaboration — ¹Physik-Department, Technische Universität München, Garching, Germany — ²INFN Laboratori Nazionali del Sud, Catania, Italy

The Gerda (GERmanium Detector Array) experiment, located in the Laboratori Nazionali del Gran Sasso (LNGS), uses ⁷⁶Ge-enriched germanium detectors to search for the lepton number violating neutrinoless double beta (0νββ) decay. The detectors are operated in liquid argon (LAr) serving both as cooling medium and as active shield against radiation. Time correlated background events can lead to signals in the Ge-, LAr- and water Cherenkov detector systems, which in turn opens new ways for their identification and suppression. The in-situ production of ^77(m)Ge by cosmic muon interactions is an example for a delayed coincidence, which will have an increasing influence on the next generation of experiments searching for the 0νββ decay of ⁷⁶Ge. This might define a minimum depth requirement for next generation rare event searches with Legend (Large Enriched Germanium Experiment for Neutrinoless ββ Decay). Therefore, mechanisms for identifying the cosmogenic ^77(m)Ge production are proposed for the first stage of Legend at LNGS. The expected event topologies are presented as well as plans for an acquisition of the coincidences. This work has been supported in part by the German Federal Ministry for Education and Research (BMBF) Verbundforschung 05A17W02 and the German Research Foundation (DFG) via the SFB1258.